diff --git a/cachet_url_monitor/scheduler.py b/cachet_url_monitor/scheduler.py
index e8ef167..f32aa67 100644
--- a/cachet_url_monitor/scheduler.py
+++ b/cachet_url_monitor/scheduler.py
@@ -13,8 +13,10 @@ class Agent(object):
     and updating the component.
     """
 
-    def __init__(self, configuration, decorators=[]):
+    def __init__(self, configuration, decorators=None):
         self.configuration = configuration
+        if decorators is None:
+            decorators = []
         self.decorators = decorators
 
     def execute(self):